Work-Hardening and Strain Rate Sensitivity of Flow Stress in High Purity Ice Single Crystals.

Abstract

Single crystals of high purity ice deformed by uniaxial compression on an Instron machine showed remarkable work- hardening after about 8% strain. By changing the strain rate during compression tests in the plastic region of the stress-strain curve, an apparent activation volume V* and a dislocation mobility exponent m were calculated from the strain rate sensitivity of flow stress. The large work-hardening and the rapid increase in the value of m beyond about 10% strain indicate that the plastic flow in this region is controlled by dislocation intersections and nonconservative motion of jogs. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1975
Accession Number
ADA018015

Entities

People

  • V. R. Parameswaran

Organizations

  • Cold Regions Research and Engineering Laboratory

Tags

DTIC Thesaurus Topics

  • Compression
  • Crystals
  • Dislocations
  • Flow
  • Hardening
  • Mechanical Properties
  • Plastic Flow
  • Sensitivity
  • Single Crystals
  • Strain Rate
  • Stress Strain Relations
  • Stresses

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.